Patent US4099079A successfully refreshed from Google Patents.
US4099079A
Expired / Lapsed
US
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Secondary-emissive layers
Assignee: US Philips Corp
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Filing: 1975-12-11
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Granted: 1978-07-04
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Expires: 1995-12-11
Abstract
Abstract A substrate bearing a secondary-emissive layer which consists of a cermet consisting of a readily evaporable metal, for example Au, Ag, Cu, Ni, Cr, Al or a nickel-chromium alloy, and an alkali metal aluminium fluoride, for example cryolite. The substrate material may be, for example mild steel, or a synthetic plastics material. It is possible to make large dynodes when using mild steel substrates which are much cheaper than silver-magnesium or beryllium-copper and the secondary-emissive layer does not require an activation treatment when incorporated in an electric discharge tube.
Inventors
- 👤 Alan George Knapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:42
CPC Classifications
H; H01; H01J; H01J43/00; H01J43/04; H01J43/06; H01J43/18; H01J43/24; H01J43/243; H01J1/00; H01J1/02; H01J1/32
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
22 words
An electrode having a secondary-emissive layer, said layer consisting essentially of a cermet comprising a readily-evaporable metal and an alkali aluminum fluoride.
Claim 2
Dependent Claim
22 words
An electrode having a secondary-emissive layer, said layer consisting essentially of a cermet comprising a readily-evaporable metal and an alkali aluminum fluoride.
Claim 3
Dependent Claim
16 words
An electrode as defined in claim 1 wherein said alkali aluminum fluoride is sodium aluminum fluoride.
Claim 4
Dependent Claim
14 words
An electrode as defined in claim 2 wherein said cermet also comprises magnesium fluoride.
Claim 5
Dependent Claim
29 words
An electrode as defined in claim 3 wherein said magnesium fluoride is by weight less than 18 percent of the total quantity of sodium aluminum fluoride and magnesium fluoride.
Claim 6
Dependent Claim
28 words
An electrode as defined in claim 1 wherein the readily-evaporable metal is a metal selected from the group consisting of gold, silver, copper, nickel, chromium and nickel-chromium alloys.
Claim 7
Dependent Claim
16 words
An electrode as defined in claim 5 wherein said alkali aluminium fluoride is sodium aluminum fluoride.
Claim 8
Dependent Claim
20 words
An electrode as defined in claim 1 wherein the cermet is by weight between 10 and 60 percent readily-evaporable metal.
Claim 9
Dependent Claim
29 words
An electrode as defined in claim 1 further comprising a substrate of mild steel and a layer of nickel or nickel-chromium alloy between said substrate and said secondary-emissive layer.
Claim 10
Dependent Claim
15 words
An electrode as defined in claim 1 further comprising a substrate of synthetic plastic material.
Claim 11
Dependent Claim
51 words
A method of manufacturing an electrode as claimed in claim 1, characterized in that a thin film of readily-evaporable metal is deposited on the substrate and that the readily-evaporable metal is then deposited together with an alkali aluminium fluoride, after which the deposition of metal and the fluoride is discontinued simultaneously.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |